}
}
+template<class T>
+void normalize_sum(T* vals, unsigned num)
+{
+ for (int normalize_pass = 0; normalize_pass < 2; ++normalize_pass) {
+ float sum = 0.0;
+ for (unsigned i = 0; i < num; ++i) {
+ sum += to_fp32(vals[i]);
+ }
+ float inv_sum = 1.0 / sum;
+ for (unsigned i = 0; i < num; ++i) {
+ vals[i] = from_fp32<T>(to_fp32(vals[i]) * inv_sum);
+ }
+ }
+}
+
// Make use of the bilinear filtering in the GPU to reduce the number of samples
// we need to make. This is a bit more complex than BlurEffect since we cannot combine
// two neighboring samples if their weights have differing signs, so we first need to
register_int("width", &output_width);
register_int("height", &output_height);
- // The first blur pass will forward resolution information to us.
- hpass_owner.reset(new SingleResamplePassEffect(this));
- hpass = hpass_owner.get();
- CHECK(hpass->set_int("direction", SingleResamplePassEffect::HORIZONTAL));
- vpass_owner.reset(new SingleResamplePassEffect(this));
- vpass = vpass_owner.get();
- CHECK(vpass->set_int("direction", SingleResamplePassEffect::VERTICAL));
+ if (movit_compute_shaders_supported) {
+ // The effect will forward resolution information to us.
+ compute_effect_owner.reset(new ResampleComputeEffect(this));
+ compute_effect = compute_effect_owner.get();
+ } else {
+ // The first blur pass will forward resolution information to us.
+ hpass_owner.reset(new SingleResamplePassEffect(this));
+ hpass = hpass_owner.get();
+ CHECK(hpass->set_int("direction", SingleResamplePassEffect::HORIZONTAL));
+ vpass_owner.reset(new SingleResamplePassEffect(this));
+ vpass = vpass_owner.get();
+ CHECK(vpass->set_int("direction", SingleResamplePassEffect::VERTICAL));
+ }
update_size();
}
void ResampleEffect::rewrite_graph(EffectChain *graph, Node *self)
{
- Node *hpass_node = graph->add_node(hpass_owner.release());
- Node *vpass_node = graph->add_node(vpass_owner.release());
- graph->connect_nodes(hpass_node, vpass_node);
- graph->replace_receiver(self, hpass_node);
- graph->replace_sender(self, vpass_node);
+ if (compute_effect != nullptr) {
+ Node *compute_node = graph->add_node(compute_effect_owner.release());
+ graph->replace_receiver(self, compute_node);
+ graph->replace_sender(self, compute_node);
+ } else {
+ Node *hpass_node = graph->add_node(hpass_owner.release());
+ Node *vpass_node = graph->add_node(vpass_owner.release());
+ graph->connect_nodes(hpass_node, vpass_node);
+ graph->replace_receiver(self, hpass_node);
+ graph->replace_sender(self, vpass_node);
+ }
self->disabled = true;
}
void ResampleEffect::update_size()
{
bool ok = true;
- ok |= hpass->set_int("input_width", input_width);
- ok |= hpass->set_int("input_height", input_height);
- ok |= hpass->set_int("output_width", output_width);
- ok |= hpass->set_int("output_height", input_height);
-
- ok |= vpass->set_int("input_width", output_width);
- ok |= vpass->set_int("input_height", input_height);
- ok |= vpass->set_int("output_width", output_width);
- ok |= vpass->set_int("output_height", output_height);
+ if (compute_effect != nullptr) {
+ ok |= compute_effect->set_int("input_width", input_width);
+ ok |= compute_effect->set_int("input_height", input_height);
+ ok |= compute_effect->set_int("output_width", output_width);
+ ok |= compute_effect->set_int("output_height", output_height);
+ } else {
+ ok |= hpass->set_int("input_width", input_width);
+ ok |= hpass->set_int("input_height", input_height);
+ ok |= hpass->set_int("output_width", output_width);
+ ok |= hpass->set_int("output_height", input_height);
+ ok |= vpass->set_int("input_width", output_width);
+ ok |= vpass->set_int("input_height", input_height);
+ ok |= vpass->set_int("output_width", output_width);
+ ok |= vpass->set_int("output_height", output_height);
+ }
assert(ok);
// The offset added due to zoom may have changed with the size.
float extra_offset_x = zoom_center_x * (1.0f - 1.0f / zoom_x) * input_width;
float extra_offset_y = (1.0f - zoom_center_y) * (1.0f - 1.0f / zoom_y) * input_height;
- ok |= hpass->set_float("offset", extra_offset_x + offset_x);
- ok |= vpass->set_float("offset", extra_offset_y - offset_y); // Compensate for the bottom-left origin.
- ok |= hpass->set_float("zoom", zoom_x);
- ok |= vpass->set_float("zoom", zoom_y);
+ if (compute_effect != nullptr) {
+ ok |= compute_effect->set_float("offset_x", extra_offset_x + offset_x);
+ ok |= compute_effect->set_float("offset_y", extra_offset_y - offset_y); // Compensate for the bottom-left origin.
+ ok |= compute_effect->set_float("zoom_x", zoom_x);
+ ok |= compute_effect->set_float("zoom_y", zoom_y);
+ } else {
+ ok |= hpass->set_float("offset", extra_offset_x + offset_x);
+ ok |= vpass->set_float("offset", extra_offset_y - offset_y); // Compensate for the bottom-left origin.
+ ok |= hpass->set_float("zoom", zoom_x);
+ ok |= vpass->set_float("zoom", zoom_y);
+ }
assert(ok);
}
assert(false);
}
- ScalingWeights weights = calculate_bilinear_scaling_weights(src_size, dst_size, zoom, offset);
+ ScalingWeights weights = calculate_bilinear_scaling_weights(src_size, dst_size, zoom, offset, BilinearFormatConstraints::ALLOW_FP16_AND_FP32);
src_bilinear_samples = weights.src_bilinear_samples;
num_loops = weights.num_loops;
slice_height = 1.0f / weights.num_loops;
tex.update(weights.src_bilinear_samples, weights.dst_samples, internal_format, GL_RG, type, pixels);
}
+ResampleComputeEffect::ResampleComputeEffect(ResampleEffect *parent)
+ : parent(parent),
+ input_width(1280),
+ input_height(720),
+ offset_x(0.0),
+ offset_y(0.0),
+ zoom_x(1.0),
+ zoom_y(1.0),
+ last_input_width(-1),
+ last_input_height(-1),
+ last_output_width(-1),
+ last_output_height(-1),
+ last_offset_x(0.0 / 0.0), // NaN.
+ last_offset_y(0.0 / 0.0), // NaN.
+ last_zoom_x(0.0 / 0.0), // NaN.
+ last_zoom_y(0.0 / 0.0) // NaN.
+{
+ register_int("input_width", &input_width);
+ register_int("input_height", &input_height);
+ register_int("output_width", &output_width);
+ register_int("output_height", &output_height);
+ register_float("offset_x", &offset_x);
+ register_float("offset_y", &offset_y);
+ register_float("zoom_x", &zoom_x);
+ register_float("zoom_y", &zoom_y);
+ register_uniform_sampler2d("sample_tex_horizontal", &uniform_sample_tex_horizontal);
+ register_uniform_sampler2d("sample_tex_vertical", &uniform_sample_tex_vertical);
+ register_uniform_int("num_horizontal_samples", &uniform_num_horizontal_samples);
+ register_uniform_int("num_vertical_samples", &uniform_num_vertical_samples);
+ register_uniform_int("vertical_int_radius", &uniform_vertical_int_radius);
+ register_uniform_float("inv_vertical_scaling_factor", &uniform_inv_vertical_scaling_factor);
+ register_uniform_int("output_samples_per_block", &uniform_output_samples_per_block);
+ register_uniform_int("num_horizontal_filters", &uniform_num_horizontal_filters);
+ register_uniform_int("num_vertical_filters", &uniform_num_vertical_filters);
+ register_uniform_float("slice_height", &uniform_slice_height);
+ register_uniform_float("horizontal_whole_pixel_offset", &uniform_horizontal_whole_pixel_offset);
+ register_uniform_int("vertical_whole_pixel_offset", &uniform_vertical_whole_pixel_offset);
+ register_uniform_float("inv_input_height", &uniform_inv_input_height);
+ register_uniform_float("input_texcoord_y_adjust", &uniform_input_texcoord_y_adjust);
+
+ call_once(lanczos_table_init_done, init_lanczos_table);
+}
+
+ResampleComputeEffect::~ResampleComputeEffect()
+{
+}
+
+string ResampleComputeEffect::output_fragment_shader()
+{
+ char buf[256] = "";
+ return buf + read_file("resample_effect.comp");
+}
+
+// The compute shader does horizontal scaling first, using exactly the same
+// two-component texture format as in the two-pass version (see the comments
+// on ResampleComputeEffect). The vertical scaling calculates the offset values
+// in the shader, so we only store a one-component texture with the weights
+// for each filter.
+void ResampleComputeEffect::update_texture(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
+{
+ ScalingWeights horiz_weights = calculate_bilinear_scaling_weights(input_width, output_width, zoom_x, offset_x, BilinearFormatConstraints::ALLOW_FP32_ONLY);
+ ScalingWeights vert_weights = calculate_raw_scaling_weights(input_height, output_height, zoom_y, offset_y);
+ uniform_vertical_int_radius = vert_weights.int_radius;
+ vertical_scaling_factor = vert_weights.scaling_factor;
+ uniform_inv_vertical_scaling_factor = 1.0f / vert_weights.scaling_factor;
+ src_horizontal_bilinear_samples = horiz_weights.src_bilinear_samples;
+ src_vertical_samples = vert_weights.src_bilinear_samples;
+ uniform_num_horizontal_filters = horiz_weights.dst_samples;
+ uniform_num_vertical_filters = vert_weights.dst_samples;
+ slice_height = 1.0f / horiz_weights.num_loops;
+
+ // Encode as a two-component texture. Note the GL_REPEAT.
+ glActiveTexture(GL_TEXTURE0 + *sampler_num);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, tex_horiz.get_texnum());
+ check_error();
+
+ tex_horiz.update(horiz_weights.src_bilinear_samples, horiz_weights.dst_samples, GL_RG32F, GL_RG, GL_FLOAT, horiz_weights.bilinear_weights_fp32.get());
+
+ glActiveTexture(GL_TEXTURE0 + *sampler_num + 1);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, tex_vert.get_texnum());
+ check_error();
+
+ // Storing the vertical weights as fp16 instead of fp32 saves a few
+ // percent on NVIDIA, and it doesn't seem to hurt quality any.
+ // (The horizontal weights is a different story, since the offsets
+ // can get large and are fairly accuracy-sensitive. Also, they are
+ // loaded only once per workgroup, at the very beginning.)
+ tex_vert.update(vert_weights.src_bilinear_samples, vert_weights.dst_samples, GL_R16F, GL_RED, GL_HALF_FLOAT, vert_weights.raw_weights.get());
+
+ // Figure out how many output samples each compute shader block is going to output.
+ int usable_input_samples_per_block = 128 - 2 * uniform_vertical_int_radius;
+ int output_samples_per_block = int(floor(usable_input_samples_per_block * vertical_scaling_factor));
+ if (output_samples_per_block < 1) {
+ output_samples_per_block = 1;
+ }
+ uniform_output_samples_per_block = output_samples_per_block;
+}
+
namespace {
ScalingWeights calculate_scaling_weights(unsigned src_size, unsigned dst_size, float zoom, float offset)
ScalingWeights ret;
ret.src_bilinear_samples = src_samples;
ret.dst_samples = dst_samples;
+ ret.int_radius = int_radius;
+ ret.scaling_factor = scaling_factor;
ret.num_loops = num_loops;
ret.bilinear_weights_fp16 = nullptr;
ret.bilinear_weights_fp32 = move(weights);
+ ret.raw_weights = nullptr;
return ret;
}
} // namespace
-ScalingWeights calculate_bilinear_scaling_weights(unsigned src_size, unsigned dst_size, float zoom, float offset)
+ScalingWeights calculate_bilinear_scaling_weights(unsigned src_size, unsigned dst_size, float zoom, float offset, BilinearFormatConstraints constraints)
{
ScalingWeights ret = calculate_scaling_weights(src_size, dst_size, zoom, offset);
unique_ptr<Tap<float>[]> weights = move(ret.bilinear_weights_fp32);
// samples, since one would assume overall errors in the shape don't matter as much.
const float max_error = 2.0f / (255.0f * 255.0f);
unique_ptr<Tap<fp16_int_t>[]> bilinear_weights_fp16;
- int src_bilinear_samples = combine_many_samples(weights.get(), src_size, src_samples, ret.dst_samples, &bilinear_weights_fp16);
- unique_ptr<Tap<float>[]> bilinear_weights_fp32 = nullptr;
+ unique_ptr<Tap<float>[]> bilinear_weights_fp32;
double max_sum_sq_error_fp16 = 0.0;
- for (unsigned y = 0; y < ret.dst_samples; ++y) {
- double sum_sq_error_fp16 = compute_sum_sq_error(
- weights.get() + y * src_samples, src_samples,
- bilinear_weights_fp16.get() + y * src_bilinear_samples, src_bilinear_samples,
- src_size);
- max_sum_sq_error_fp16 = std::max(max_sum_sq_error_fp16, sum_sq_error_fp16);
- if (max_sum_sq_error_fp16 > max_error) {
- break;
+ int src_bilinear_samples;
+ if (constraints == BilinearFormatConstraints::ALLOW_FP32_ONLY) {
+ max_sum_sq_error_fp16 = numeric_limits<double>::max();
+ } else {
+ assert(constraints == BilinearFormatConstraints::ALLOW_FP16_AND_FP32);
+ src_bilinear_samples = combine_many_samples(weights.get(), src_size, src_samples, ret.dst_samples, &bilinear_weights_fp16);
+ for (unsigned y = 0; y < ret.dst_samples; ++y) {
+ double sum_sq_error_fp16 = compute_sum_sq_error(
+ weights.get() + y * src_samples, src_samples,
+ bilinear_weights_fp16.get() + y * src_bilinear_samples, src_bilinear_samples,
+ src_size);
+ max_sum_sq_error_fp16 = std::max(max_sum_sq_error_fp16, sum_sq_error_fp16);
+ if (max_sum_sq_error_fp16 > max_error) {
+ break;
+ }
}
}
return ret;
}
+// Unlike calculate_bilinear_scaling_weights(), this just converts the weights,
+// without any combining trickery. Thus, it is also much faster.
+ScalingWeights calculate_raw_scaling_weights(unsigned src_size, unsigned dst_size, float zoom, float offset)
+{
+ ScalingWeights ret = calculate_scaling_weights(src_size, dst_size, zoom, offset);
+ unique_ptr<Tap<float>[]> weights = move(ret.bilinear_weights_fp32);
+ const int src_samples = ret.src_bilinear_samples;
+
+ // Convert to fp16 (without any positions, as they are calculated implicitly
+ // by the compute shader) and normalize.
+ unique_ptr<fp16_int_t[]> raw_weights(new fp16_int_t[ret.dst_samples * src_samples]);
+ for (unsigned y = 0; y < ret.dst_samples; ++y) {
+ for (int i = 0; i < src_samples; ++i) {
+ raw_weights[y * src_samples + i] = fp32_to_fp16(weights[y * src_samples + i].weight);
+ }
+ normalize_sum(raw_weights.get() + y * src_samples, src_samples);
+ }
+
+ ret.raw_weights = move(raw_weights);
+ return ret;
+}
+
void SingleResamplePassEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
{
Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
}
}
+void ResampleComputeEffect::get_compute_dimensions(unsigned output_width, unsigned output_height,
+ unsigned *x, unsigned *y, unsigned *z) const
+{
+ *x = output_width;
+ *y = (output_height + uniform_output_samples_per_block - 1) / uniform_output_samples_per_block;
+ *z = 1;
+}
+
+void ResampleComputeEffect::set_gl_state(GLuint glsl_program_num, const string &prefix, unsigned *sampler_num)
+{
+ Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
+
+ assert(input_width > 0);
+ assert(input_height > 0);
+ assert(output_width > 0);
+ assert(output_height > 0);
+
+ if (input_width != last_input_width ||
+ input_height != last_input_height ||
+ output_width != last_output_width ||
+ output_height != last_output_height ||
+ offset_x != last_offset_x ||
+ offset_y != last_offset_y ||
+ zoom_x != last_zoom_x ||
+ zoom_x != last_zoom_y) {
+ update_texture(glsl_program_num, prefix, sampler_num);
+ last_input_width = input_width;
+ last_input_height = input_height;
+ last_output_width = output_width;
+ last_output_height = output_height;
+ last_offset_x = offset_x;
+ last_offset_y = offset_y;
+ last_zoom_x = zoom_x;
+ last_zoom_y = zoom_y;
+ }
+
+ glActiveTexture(GL_TEXTURE0 + *sampler_num);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, tex_horiz.get_texnum());
+ check_error();
+ uniform_sample_tex_horizontal = *sampler_num;
+ ++*sampler_num;
+
+ glActiveTexture(GL_TEXTURE0 + *sampler_num);
+ check_error();
+ glBindTexture(GL_TEXTURE_2D, tex_vert.get_texnum());
+ check_error();
+ uniform_sample_tex_vertical = *sampler_num;
+ ++*sampler_num;
+
+ uniform_num_horizontal_samples = src_horizontal_bilinear_samples;
+ uniform_num_vertical_samples = src_vertical_samples;
+ uniform_slice_height = slice_height;
+
+ uniform_horizontal_whole_pixel_offset = lrintf(offset_x) / float(input_width);
+ uniform_vertical_whole_pixel_offset = lrintf(offset_y);
+
+ uniform_inv_input_height = 1.0f / float(input_height);
+ uniform_input_texcoord_y_adjust = 0.5f / float(input_height);
+}
+
} // namespace movit
projects / movit / blobdiff